Emergency safety-plug.



F KOSTLAN EMERGENCY SAFETY PLUG. (Application filed May 16, 1902.)

I E g? (No Model.)

Wimesses.

UNITED STATES FRANK KOSTLAN,

OF TRAER, IOWA.

EM ERGENCY SAFETY-PLUG.

SPECIFICATION forming part of Letters Patent No. 708,562, datedSeptember 9, 1902.

Application filed May 16, 1902.

To all whom, it may concern:

Be it known that I, FRANK KOSTLAN, a citizen of the United States,residing at Traer, in the county of Tama and State of Iowa, haveinvented certain new and useful Improvements in Emergency Safety-Plugs,of which the following is a specification.

The object of this invention is to produce a safety deviceforsteam-boilers so constructed that on the blowingout of a fusible plugthe opening may be closed and steam kept up until it is convenient torenew said plug.

The nature of the invention will fully appear from the descriptionandclaim following, reference being had to the accompanying drawings, inwhich- Figure l is a sectional View showing the construction ofmyimproved safety-plug. Fig. 2 shows the manner in which the same isapplied to a steam-boiler.

In the drawings,A denotes the outer shell, and B the crown-sheet, of asteam-boiler. In the crown-sheet is screwed a hollow plug 0, fitted witha core D, of some fusible metal, lead being commonly used. Directly inline with this plug is placed my device for closing the hollow plug onthe melting of its core and which is described as follows:

E is a gland screwing into a hole in the outer shell directly in linewith that in the crown-sheet which takes the hollow plugthe safetyplug,as it is usually called. This gland is provided with a stuffing-nut F tomake a steam-tight joint around the stem G of the closing-plug. Theupper end of the stem is provided with a suitable hand-wheel H, by whichit may be turned. It is threaded into the gland at G, so as to move upor down when turned. The stem is also made tubu lar, and into its lowerendis screwed an auxiliary stem G threaded at G and provided with aset-nut I. By this means the length of the stem may be adjusted to thedistance of the outer shell of the boiler from the crown- Serial No.107,582. (No model.)

sheet, which distance varies, of course, in different boilers. In theexpanded lower end of the auxiliary stem is secured a conical plug J, offusible metal, such as lead.

The operation of the device will be readily understood. In the event ofthe crown-sheet becoming overheated the fusible plug melts and steamrushes into the combustion-chamber, quenching the fire to some extentand removing any danger of an explosion. It is not convenient to drawthe fire at the time, however, so the engineer simply screws down theemergency safety-plug and closes the opening over the fire, the conicalend of the plug readily entering the hole in the original safety-plugand its softness securing a steamtight joint when screwed tightly inplace. He may then inject more water into the boiler, regulate his fireaccording to requirements, and continue the boiler in service until itis convenient to insert a new safety-plug. At such time theemergency-plug may, if necessary, be entirely removed by unscrewing thegland and the conical tip of soft metal be renewed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination with a steam-boiler provided with a safetyplug,substantially as described, of an emergency safety-plug, comprising agland adapted to be screwed into the boiler-shell, a tubular stemscrewing into said gland, and provided with a suitable handwheel, andauxiliary stem screwing into said tubular stem, and provided with asuitable setnut, and a terminal, conical tip of soft metal secured inthe end of said auxiliary stem.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK KOSTLAN.

WVitnesses:

J F. KLADIVO, C. A. PRATT.

